[issue24915] Profile Guided Optimization active by-default

[Brett Cannon]

Brett Cannon added the comment:

the v02 patches LGTM. I'm fine with seeing those committed as-is knowing Alecsandru is actively working towards Clang support.

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stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24915>
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